I have a window to test.
I will do a small test of the plain glass (with black tape to test off of) compared to some packing material white Styrofoam sheet( black tape again) , 1 layer tested then a 2nd layer.
I suspect I will see a notable improvement.
Also the white Styrofoam let the sunlight threw , it was still effective as a window for light in that regard but not so easy to see out..not that I cared , it's a side window looking over the neighbors house.
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